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***Announcement: Early next week, we’ll be merging the current Fios and Wireless Communities into the all new Verizon Community! Beginning the evening of Sunday 12/4, both Communities will be placed in read-only mode. You’ll still be able to visit the Communities and browse content, but login will be disabled. On the afternoon of Monday 12/5, all users will be able to log into the new Verizon Community. We expect the new Community to be fully functional the morning of Friday 12/9. Additional details can be found in the Announcements board and under Featured Topics!
Why does new iPhone not work with new SIM, works only with old SIM

My son had an iPhoneSE and we bought him an iPhone11.  We did a factory reset on the old phone.  But when we activated the new phone, it would not send text messages to any non-iPhone users.  We fixed the problem when we put the SIM card from the old phone into the new one.

Why did this happen?  And is there any reason we can't continue with the old SIM in the new phone?  Is there any reason the new phone needs the new SIM?  If so, how do we get the new SIM to work properly?